Magnesium
What is it?
Magnesium is an essential mineral cofactor in over 300 enzymatic reactions in the body — including protein synthesis, ATP production, muscle function, nervous system regulation and glycemic control. It is the fourth most abundant mineral in the human body. Athletes lose significant magnesium through sweat and urine during exercise, making subclinical deficiency common in intense physical activity practitioners. The form of magnesium determines its absorption, destination in the body and specific effects.
Main Benefits
- Support for muscle function and cramp reduction
- Improved sleep quality
- Nervous system regulation and stress reduction
- Support for protein synthesis and energy production (ATP)
- Blood sugar control and insulin sensitivity
- Cardiovascular health and blood pressure regulation
- Bone health support
Who it's for
- •Athletes and intense physical activity practitioners
- •People with frequent muscle cramps
- •Individuals with sleep difficulties
- •People with high stress levels
- •Those with diets poor in green vegetables and whole grains
- •People with diabetes or insulin resistance
- •Women with intense PMS
Common Dose
200mg to 400mg of elemental magnesium per day. Note: always check the ELEMENTAL magnesium on the label, not the total compound weight. Take at night for better absorption and sleep benefit.
Available Types
Magnesium Glycinate
Characteristics
- •Magnesium chelated with glycine
- •Superior intestinal absorption
- •Lower laxative effect
- •Glycine has additional calming properties
Pros
- Best gastrointestinal tolerance
- Glycine enhances sleep effect
- High bioavailability
Cons
- Higher cost than oxide and citrate
Best for
- Sleep and relaxation
- Cramps and muscle function
- General daily use
Magnesium Threonate
Characteristics
- •Only form that efficiently crosses the blood-brain barrier
- •Developed by MIT for brain health
- •Increases magnesium levels in the brain
- •Cognitive focus and neuroprotection
Pros
- Only one with proven brain action
- Cognitive benefits — memory and focus
- Neuroprotection
Cons
- Much higher cost
- Less elemental magnesium per capsule
- Fewer studies for muscle function
Best for
- Cognitive health and memory
- Neuroprotection in older people
- Those seeking specific brain benefit
Magnesium Malate
Characteristics
- •Magnesium combined with malic acid
- •Malic acid supports the Krebs cycle and ATP production
- •Good intestinal absorption
- •Less laxative effect than citrate
Pros
- Dual benefit: magnesium + malate energy support
- Good tolerance
- Studied in fibromyalgia and chronic fatigue
Cons
- Less studied for sleep than glycinate
Best for
- Energy and fatigue reduction
- Daytime use (morning)
- Fibromyalgia and chronic muscle pain
Magnesium Citrate
Characteristics
- •Magnesium combined with citric acid
- •Good bioavailability
- •Moderate laxative effect
- •Accessible cost
Pros
- Good absorption with accessible cost
- Widely available
- Useful for constipation
Cons
- Laxative effect may be unwanted at higher doses
Best for
- General use with cost-benefit
- People with constipation
- Those wanting an accessible option
Magnesium Taurate
Characteristics
- •Magnesium combined with taurine
- •Focus on cardiovascular health
- •Taurine has additional cardioprotective and neurological action
- •Good absorption
Pros
- Additional cardiovascular benefit from taurine
- Heart rhythm support
- Good tolerance
Cons
- Higher cost
- Less studied for sleep and muscle function
Best for
- Cardiovascular health
- People with arrhythmia or high blood pressure
- Heart support
Magnesium Oxide
Characteristics
- •Cheapest and most common form on the market
- •Very low intestinal absorption (~4%)
- •High elemental magnesium content per capsule
- •Strong laxative effect
Pros
- Very low cost
- Useful as osmotic laxative
Cons
- Absorption of only ~4% — most does not reach the blood
- Intense laxative effect
- Not recommended for magnesium supplementation
Best for
- Only as laxative — not for magnesium supplementation
Quick Comparison
| Form | Absorption | Main focus | Laxative effect | Cost |
|---|---|---|---|---|
| Glycinate | High | Sleep and relaxation | Minimal | Medium |
| Threonate | High (brain) | Cognition | Minimal | High |
| Malate | Good | Energy and fatigue | Low | Medium |
| Citrate | Good | General use | Moderate | Low |
| Taurate | Good | Cardiovascular | Low | Medium-high |
| Oxide | Very low (~4%) | Laxative | High | Very low |
How to Choose
Magnesium Glycinate
Choose if:
- You want to improve sleep quality
- You have frequent muscle cramps
- You seek the best gastrointestinal tolerance
Magnesium Threonate
Choose if:
- The focus is cognitive health and memory
- You want specific brain action
- High cost is not an obstacle
Magnesium Malate
Choose if:
- You want energy support and fatigue reduction
- You prefer to take it in the morning
- You have fibromyalgia or chronic muscle pain
Magnesium Citrate
Choose if:
- You seek cost-benefit
- You have intestinal constipation
- You want a widely available option
Magnesium Taurate
Choose if:
- You have cardiovascular concerns
- You want the additional benefit of taurine
- You seek heart rhythm support
Magnesium Oxide
Choose if:
- You need an osmotic laxative — not for magnesium supplementation
What the Science Says
Magnesium is one of the minerals with the highest prevalence of subclinical deficiency in the general population — it is estimated that 50–80% of people do not reach the recommended daily intake. Studies show that supplementation improves sleep quality, reduces cramps, improves insulin sensitivity and supports cardiovascular health. The form of magnesium is decisive for absorption: oxide (~4%), citrate (~30%), glycinate and threonate (>80%). Magnesium Threonate is the only one with evidence for increasing brain magnesium levels.
Possible Side Effects
Laxative effect varies by form — oxide and citrate have greater effect, glycinate and threonate are well tolerated. Very high doses may cause diarrhea, nausea and, rarely, hypotension. People with kidney failure should consult a doctor before supplementing.
Final Summary
Magnesium is an essential supplement for most people — especially athletes. The form matters a lot: avoid oxide (low absorption), prefer glycinate for sleep and general use, malate for energy, threonate for cognition, citrate for cost-benefit. Taking at night maximizes sleep and recovery benefits. One of the supplements with the greatest impact on overall quality of life.